Hexagonal die



March 9 1926. 1,576,166

F. O. WELLS HEXAGONAL DIE Filed July 5, 1924 IN V EN TOR.

Freak 0 W216. G71 4 1 A TTORNE Y.

Patented Mar. 9, 1926.

time

UNITED STATES P TENToF-FICE.

FRANK 0. warns, on GREENFIELD, MASSACHUSETTS.

HEXAGONAL DIE.

Application filed July 3,

vided for varying the diameter of the threadbeing cut by drawing the sides together, or, by permitting the slit to open when rotated outward. Broadly, it comprises a die formed with a plurality of thread forming lands which extend parallel with the axis and of a length which is equal to the thickness of the stock composing the die. Located intermediateof the length of the die and spanning the are shaped space between the lands is a strengthening rib which is formed withinclined sides which taper back substantially to the outer marginal edges of the dieior permitting the chips to be raa dially thrown away from the cutting edges and for providing free and'easy access .to

the lands for thoroughly lubricatingthe work when a thread is beingcut. Theconstruction and formation or the strengthening rib being such that the stresses imparted by the lands when a thread is being'cutare distributed both axially and radially. Heretofore, it has been a common practice to arrange or locate the strengthening rib between the lands substantially at one side or edge of the die instead of locating it in a plane represented by the median line of thedie or screw plate. In the present improvement the strengthening rib is located an equal distance from the opposite sides or faces of the die. r

Referring to the drawings: Fig. 1 is a plan view showing the tour thread forming lands and the slit at one side with the adjusting screw spanning the slit for accurately Varying the diameter of the thread being formed or cut on the work. Fig. 2 is a vertical sectional viewon the line 22 of Fig. 1 looking in the direction of the arrows showing two of the lands, and the oppositely located inclined sides of two of the recesses or grooves which extend from the marginal edge to the cutting edges of the lands'up to the strengthening rib, and

1924.. Serial: No. 723,894.

Fig. S'is a horizontal sectional view on the line 3 3 of Fig. 1 showingtwo [of the lands an-danother oneof the strengtheningribs between these landsand the adjacently located inclined grooves.

Referring to the drawings in detail: 7

1 designates the body portion of the die which isformed with a slit 2 in one side which is spanned and connected by the ad justing screw 3 for accurately'varying the diameter of the thread to be cut. lVhen the screw is rotated outward the die will spring open. It is reduced in size when the thread is turned inward. This die, as shown, is formed with four inwardly projecting ribs 4, 5, 6, and 7, which extend radially inward into the opening 1 and on each of their inner edges is cut the thread forming teeth {3, 9, 10, and 11. Formed between the pro ecting ribs 4, 5, 6, and 7 on'one side oi the die are the inclined shaped recesses 12, 13,

14, and 15 and on the other side of thedie V are the correspondingly shaped recesses-16,

17, 18, and 19 as shown in the sectional views in Figs. 2 and8. The forward-edges of these inclined shapedrecessedportions terminate slightly back of the cutting teeth 8, 9, 10, and 11 as shownat 2O producing the transversely located openings 22 which connect the opposite sides of the, recesses. These edges are located in a plane repre sented by the median line 20" in Fig. 2. When the device is used to form a thread on a bolt or other piece of work the inclined recesses 12 to 15 on one side and the inclined recesses 16 to 19 on the other side as well 3 the openings 22 serve as largeopenings to permit the severed chips or removed metal to freely flow outward away from the work on which a thread is being cut. At the same time the centrally disposed ribs 20 serve to firmlyretain and support the cut,- ting lands 4:, 5, 6, and 7 These centrally disposed connecting ribs between the lands serve the double purpose of firmly staining them in the plane of the median line 202O cessed portions is to permit free access to the threads of the lands vfor oiling.

It will also be observed that the crosssection of the supporting ribs 20 is substan'tially that of a pyramid. with the apex at 20 and the base at the outer edges of the hexagonal die. This pyramidal shaped section is indicated at 21 in Figs. 2 and 3 whereby the ribs 20 between the lands are supported or braced in opposite directions along the axial line 22-22. An important feature is that the hexagonal shaped die may be used with an ordinary wrench or, in a die stock. a H It will be observed that the cutting lands 4, 5, 6, and 7 terminate-in the-borders of the cone shaped openings 12, 13, let, and 15; and also the oppositely disposed cone or concave shaped recesses on the opposite side or end of the member. It will also be observed that the ribs 20 are are shaped.

The die is preferably formedby the forging process; the angle of each recess being such that the forging tool may be readily withdrawn. The openin 's 22 are produced during the forging process These openings are important and may be termed clearance holes for the chips and oil.

hat I claim is: I

1. A thread forming die comprising a one piece member which is formed with an opening therethrough with radially arranged projections extending into the opening and having thread forming teeth on the projections and a plurality of cone shaped.

recesses extending from the outer opposite surfaces of the die and terminating in an are shapedsurface or edge back'ot the thread forming teeth or cutting edges of the lands and in a plane the opposite faces; j 2. A hexagonal thread forming diecom- )risin a one )lGCB member which is formed with an opening therethrough with radially arranged projections extending into the opening and having thread forming teeth on the projections and a plurality of inclined shaped recesses extending from the outer faces of the said-die and terminating in an are shaped edge that is located back of the thread forming teeth or cutting edges of the lands, said inclined recesses being located on opposite sides of the die and the material between the recesses providing strengthening ribs.

' A die for the purpose'described, comprising amember formed with an opening therethrough a plurality of lands extending into the opening cone shaped strength ening ribs located between the lands and armidway between e e V the OPPOSltGfflCQS of the member and the ranged in .the median plane of the die, whereby the lands are strengthened both transx' ersely and in the median plane the construction and arrangement of the ribs being such that the lands are strengthened goth longitudinally'and transversely of the 1e. 7 '4. A' hexagonal shaped thread forming die having an opening therethrough, a plurality of thread forming lands on projections which extend axially from one face thesize-ofthe die for varying the diameter of the thread to be formed.

6. A die comprising a member having an opening therethrough, and radially arranged projections extending into the openings and having thread forming teeth on the projections, the portions of the member between the projections and on opposite sides of the member having concave shaped recesses in cross sectionand the edges of which recesses constitutes the borders of the projections; the border lines being in said recesses terminating in a plane that is located midway between theopposite faces of the membe 7 A screw cutting diecomprising a mean her having an opening through the same and which is formed with a plurality of cone-shaped recesses on its opposite outer ends which extend from its outer ends to a plane located substantially midway between its 'ends,' the opening having thread forming lands which project into the opening and the die having a plurality of axially arranged clearance openings for chips and oil which are located between the said lands and the inner ends of the inclined recesses and a strengthening rib mldway between the ends of the die.

FRANK ELLS. 

